CN105771663B - A kind of electrodialysis plant and method for starch sugar hydrolyzate desalination - Google Patents
A kind of electrodialysis plant and method for starch sugar hydrolyzate desalination Download PDFInfo
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- CN105771663B CN105771663B CN201511020589.2A CN201511020589A CN105771663B CN 105771663 B CN105771663 B CN 105771663B CN 201511020589 A CN201511020589 A CN 201511020589A CN 105771663 B CN105771663 B CN 105771663B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/422—Electrodialysis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/46—Apparatus therefor
- B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
- B01D61/485—Specific features relating to the ion-exchange material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/58—Multistep processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
The present invention provides a kind of electrodialysis plants and method for starch sugar hydrolyzate desalination, described device includes electrodialysis cell, the electrodialysis cell is at least one electrodialysis membrane stack, the electrodialysis membrane stack includes cathode, anode, anion-exchange membrane and cation-exchange membrane, the anion-exchange membrane and cation-exchange membrane are alternately arranged to form light room and dense room, and ion-exchanger is filled in the light room.It is less than 50mg/L or lower using the starch sugar hydrolyzate salt content after described device desalination, production starch sugar can be directly used in；The electrodialysis concentrated water of generation uses cycle concentration to reduce concentrated water drainage, can avoid generating a large amount of high concentrated organic wastewaters and reduces new water consumption；The problems such as inhibiting sugar that filter loss and serious fouling membrane occurs by amberplex simultaneously, can promote the engineering application of starch sugar hydrolyzate electrodialysis desalination technology.
Description
Technical field
The present invention relates to starch sugar hydrolyzate desalinating process fields, are related to a kind of electric osmose for starch sugar hydrolyzate desalination
Analysis apparatus and method more particularly to a kind of enhancing ion migration electrodialysis plant for realizing starch sugar hydrolyzate advanced desalination and side
Method.
Background technology
Glucose industry is one of the important channel of agriculture industrialization and further processing of grains.As glucose industry is quickly sent out
Exhibition, the scale and production capacity of starch sugar enterprise constantly expand.According to statistics, about 15,000,000 tons of the various starch sugar procut yield in the U.S., wherein
The consumption figure of starch sugar procut has been more than sucrose.The statistical data of Chinese fermentation industry association shows that Chinese starch sugar had in 2005
26 major class products, production capacity reach 6,000,000 tons, occupy the second in the world.Corn is the farming that yield is most in world food crop
Object greatly develops corn deep processing industry, and the pillar industry of many countries in the world is had become for producing the products such as starch sugar.
Traditional corn processes the technological process of starch sugar, including：Cornstarch-starch liquefacation-saccharification-mistake
Filter-decoloration-ion exchange-evaporation etc. obtains crystalline product.In the technological process, generally use ion-exchange carries out
Starch sugar desalination (State of Zhao's will etc., grain and grease, 2007,10：4-8), the disadvantage is that ion exchange bed valve is more, operated
Journey very complicated, be not easy to realize automatically control, operating cost is high and needs to consume a large amount of acid-alkali regeneration resins, in addition, bacterium is easy
Bred in bed, ion exchange resin can into pure water vadose solution organic matter, a large amount of high concentrated organic wastewaters can be generated, easily to ring
Border pollutes.
Starch sugar production waste water is mainly derived from technique waste water, the flushing water of various equipment, washings and liquefaction and sugar
The cooling water etc. in change stage, comprehensive draining water quality characteristics are salt content high (average salinity is about 10000mg/L), CODCr
(8000-10000mg/L) and SS are also higher, belong to a kind of difficult high concentrated organic wastewater.Have researcher to this waste water at
Reason expands research, such as Zhu Jie high (northern environment, 2011,23 (11)：59-61) select PEIC anaerobic reactors and A2/ O lives
Property sludge pool process handle starch sugar waste water, and be applied to industrial practice.Open (Treatment of Industrial Water, 2004,24 (4) such as sign：
A kind of starch sugar waster water process 56-58) is introduced, the technique includes activated carbon biological filtering tower combined working (ABF), jet-flow aeration (J) and exposes
Gas biofilter (BAF) etc..King's shen and Xia Yongmei (Jilin water conservancy, 2010,1：It 6-8) inquires into and starch is handled using microbial bacterial agent
Sugared waste water, investigates that pH, suspension content (SS) under aerobic and anaerobic conditions, ammonia nitrogen contains and the parameters such as COD (COD) become
Change, it is determined that best bacteria suspension concentration and processing time etc..Although the starch sugar waste water of these methods processing at present has certain effect,
But the shortcomings of there are still processing cost height, process complexity and being difficult to realize wastewater to reach standard, needs the life by optimizing starch sugar
Production and desalinating process realize waste water discharge-reducing from source.
In recent years, some researchers have inquired into the salinity using electroosmose process removing glucose syrup.Such as it is military it is farsighted (food and
Fermentation industry, 2012,38 (7)：It 137-140) has inquired into and electrodialytic technique is applied to starch sugar desalinating process, with ion exchange
Method is compared, and does not generate a large amount of high concentrated organic wastewaters, can effectively reduce desalination cost, and contributes to environmental protection and production continuous
Stable operation.Sun Lu etc. (Food Additives Used in China, 2011,6：It 136-140) inquires into using miscellaneous in electroosmose process removal Xylose
The method of matter ion obtains the operation conditions optimizations such as current density, circular flow, temperature, operation concentration.(the agricultures such as Wang Qiushuan
Industrial engineering (IE) journal, 2008,24 (10)：It 243-247) inquires into and the feasible of soy oligosaccharides sugar juice desalination is carried out using electrodialytic technique
Property.Patent about electrodialytic technique for starch sugar desalination also has been reported that, as CN 202803120U propose that one kind being used for syrup
The electrodialysis plant system of desalination can be used for the desalting refinement of syrup in starch sugar production, its main feature is that by integrating pre-treatment
Device and cleaning device reduce fouling membrane, but the method that the patent proposes still cannot be solved thoroughly in the electrodialysis system by starch
Ion exchange membrane pollution problem caused by inorganic matter, organic matter and microorganism etc. in sugared hydrolyzate.CN 102492782B propose one
Kind is using method electrodialysis removing syrup salinity and produce glucose syrup, its main feature is that will wait for that desalination syrup is divided into 2 in proportion
Part, distribution enter the light room of electrodialysis and dense room, and wherein desalination syrup is produced for starch sugar, and salt heavy syrup is used to ferment,
It is significantly reduced the production cost of starch sugar desalination, but this method does not account in syrup electrodialytic process because of living contaminants,
The problem of causing electrodialysis system intermediate ion exchange membrane to form microbial contamination.
In short, conventional electrodialytic technique is used for syrup desalination, due to starch sugar hydrolyzate there are salt content low, solution resistance
Greatly, and conventional commercial ionic membrane leakage sugar is serious, and the ion mobility of electrodialytic process can be caused relatively low, system there are still
The problems such as desalting efficiency is low, sugared loss late is high, fouling membrane is serious, therefore the technology is also caused to be unable to get application.
Invention content
For starch sugar hydrolyzate, using conventional electrodialysis processing, that there are desalting efficiencies is low, fouling membrane is serious and sugared loss late
The shortcomings of high, and use conventional ion exchange process desalination, that there are operating procedures is complicated, operating cost is high, a large amount of soda acids of consumption,
The problems such as generating high concentrated organic wastewater and easily causing environmental pollution, the present invention provides one kind being used for starch sugar hydrolyzate desalination
Electrodialysis plant and method, it is intended to solve that conventional electrodialysis desalination efficiency is low, sugar is inhibited to be leaked by amberplex
Loss and fouling membrane it is serious the problems such as, to promote the engineering application of starch sugar hydrolyzate electrodialysis desalination technology.
For this purpose, the present invention uses following technical scheme：
A kind of electrodialysis plant for starch sugar hydrolyzate desalination, described device includes electrodialysis cell, the electric osmose
Analysis unit is at least one electrodialysis membrane stack, and the electrodialysis membrane stack includes that cathode, anode, anion-exchange membrane and cation are handed over
Change film, the anion-exchange membrane and cation-exchange membrane are alternately arranged to form light room and dense room, in the light room filled with from
Sub- exchanger.
The electrodialysis membrane stack unit further includes the components such as partition board and clamp device, to become complete electrodialytic membranes
Heap.
The ion-exchanger is inanimate matter class ion-exchanger and/or organic matter class ion-exchanger.The ion is handed over
Changing the type of agent can be selected according to the target of starch sugar hydrolyzate desalination.
Preferably, the inanimate matter class ion-exchanger is zeolite.
Preferably, the organic matter class ion-exchanger is ion exchange resin or and/or ion-exchange fibre.
Preferably, the ion exchange resin be strongly acidic cation-exchange, it is strong basic type anion-exchange resin, weak
Acid type cation exchange resin, weak base type anion exchange resin, macroreticular ion exchange resin and gel type ionic exchange tree
In fat any one or at least two combination.
The ion-exchanger being filled in the light room of electrodialysis cell can promote the Ion transfer in electrodialysis system to transmit.
The principle that the ion-exchanger filled in the light room of electrodialysis membrane stack promotes Ion transfer to transmit is：When in starch sugar hydrolyzate from
When sub- concentration is relatively low, solution resistance can be caused to increase and ion mobility is made to slow down；When filling ion-exchanger in light room,
Ion in solution can be adsorbed onto on ion-exchanger, and by close contact and conductive ion-exchanger occurs quickly
Migration is transmitted, thus can be improved starch sugar hydrolyzate desalting efficiency and be reached the target of advanced desalination.
Described device using the ion-exchanger enhancing ion migration of filling to realize starch sugar hydrolyzate electrodialysis desalination,
Starch sugar hydrolyzate (i.e. desalination syrup) salt content after its desalination generated is smaller than 50mg/L or lower, can be directly used for
Produce starch sugar；Cycle concentration can be used to reduce concentrated water drainage, salt content 1%-10% in the electrodialysis concentrated water of generation
Even higher, COD is less than 50mg/L, meets and arranges standard outside industrial wastewater, and a small amount of concentrated water can be arranged directly or outside into vapo(u)rization system, no
Environmental pollution can be caused, while can avoid generating a large amount of high concentrated organic wastewaters and reducing new water consumption.
Preferably, the anion-exchange membrane and cation-exchange membrane are hypotonic permeable membrane.The anion-exchange membrane and
Cation-exchange membrane is hypotonic permeable membrane.The hypotonic permeable membrane is by changing film formula and technique and/or carrying out film surface
The methods of modification, the hypotonic permeable membrane obtained with the degree of cross linking, exchange capacity and ion-selective permeability for improving ionic membrane etc. are used
It replaces the amberplex of conventional commercial, can inhibit the leakage sugar phenomenon occurred in starch sugar hydrolyzate electrodialytic process,
The sugared loss late of leakage is less than 0.5%.
Preferably, the anode is that titanium applies ruthenium iridium electrode, and cathode is that stainless steel electrode or titanium apply ruthenium iridium electrode.Ordinary circumstance
Under, anode applies ruthenium iridium electrode using titanium, and cathode uses stainless steel electrode；When electrodialysis cell is frequently fallen by PLC system control
When pole, then cathode is also required to apply ruthenium iridium electrode using titanium.
Preferably, the pole room of the electrodialysis membrane stack is connected with infusion pump, and the infusion pump is used for through pole water in pole room
Middle cycle, the pole water is by NaCl and/or Na2SO4Preparation obtains, and the pole water primarily serves conductive, cooling and rinses electrode
Effect.
Preferably, electrodialysis membrane stack concentrated water carries out cycle concentration in the dense room.Concentrated water during electrodialysis desalination
Salt content gradually rise.
Preferably, it is passed through starch sugar hydrolyzate in the light room and carries out multistage desalination.The ion-exchanger filled in light room
The Ion transfer of electrodialytic process can be promoted to transmit, starch sugar hydrolyzate can be by multistage desalination, such as 2 grades, 3 grades, 4 grades, 5 grades
Or the desalinations such as 8 grades, so that the salt content of the starch sugar hydrolyzate after desalination is dropped to less than 50mg/L or lower, meets production starch
Sugar product requirement.The desalination series of the starch sugar hydrolyzate can be hydrolyzed according to actual electrodialysis membrane stack salt rejection rate and starch sugar
The salt content of liquid is calculated.
Preferably, the electrodialysis cell is operated using constant potential.
Described device further includes the pretreatment unit being connected with electrodialysis cell.The pretreatment unit is used for electrodialysis list
The prevention of fouling membrane in member.
Preferably, the pretreatment unit includes sequentially connected decoloration unit, sterili-sation unit, thermostat unit and mistake
Filter unit.
Preferably, the decoloration unit includes activated carbon adsorption device.The decoloration unit is that those skilled in the art are public
The technology known.
Preferably, the decolorising agent that the decoloration unit uses is activated carbon.
Preferably, the sterili-sation unit includes steam generator and/or ultraviolet sterilizer.The purpose of the sterili-sation unit
It is to try to eliminate the microorganism and bacterium in starch sugar hydrolyzate, ensures follow-up membrane filtration and electrodialytic be normally carried out.
Preferably, the temperature for the steam that the steam generator generates is 100-150 DEG C, such as 105 DEG C, 110 DEG C, 115 DEG C,
120 DEG C, 130 DEG C, 135 DEG C, 140 DEG C or 145 DEG C etc..
Preferably, the thermostat unit includes plate heat exchanger.
Preferably, the temperature of feed liquid is adjusted to 20-40 DEG C by the thermostat unit, such as 22 DEG C, 25 DEG C, 28 DEG C, 30
DEG C, 32 DEG C, 35 DEG C or 38 DEG C etc., since the temperature that in electrodialysis cell, electrodialysis membrane stack is born is not higher than 40 DEG C, therefore, need
Starch sugar hydrolyzate after sterilization processing is adjusted into trip temperature, to ensure being normally carried out for electrodialysis desalination processing.
Preferably, the filter element includes purpose ceramic-film filter and/or organic membrane filter device.The mesh of the filter element
Mark is suspended matter, colloid, larger molecular organics or the thalline etc. removed in solution, dirty with the film for reducing follow-up electrodialysis cell
Dye.
To prevent the fouling membrane of electrodialysis cell, described device further includes the on-line cleaning list for cleaning electrodialysis cell
Member, the on-line cleaning unit include circulating pump and cleaning solution storage tank, and being stored in cleaning solution storage tank has cleaning solution, the circulating pump
Cleaning solution is set to be recycled between electrodialysis heap film and cleaning solution storage tank.
Preferably, the cleaning solution is that acid or alkali electroless cleaning agent, the cleaning solution are formed according to electrodialysis cell
Fouling membrane property prepare.
Preferably, described device per 1-10 days on-line cleaning electrodialysis membrane stacks it is primary, as every 2 days, 3 days, 4 days, 5 days, 6
It, 8 days or 9 days on-line cleanings it is primary, if on-line cleaning can be determined according to the fouling membrane situation in electrodialysis cell.
Preferably, the duration of each on-line cleaning be 0.5-3h, as the duration be 1h, 1.5h, 2h, 2.5h or
2.8h etc., the film properties recovery after being cleaned according to fouling membrane determine.
Another object of the present invention is to provide a kind of electrodialysis carrying out starch sugar hydrolyzate desalination using described device
Method, the method are：Starch sugar hydrolyzate is subjected to electrodialysis desalination in the electrodialysis desalination device, wherein described
Electrodialysis desalination carries out at least one electrodialysis membrane stack, and ion-exchanger is filled in the light room of the electrodialysis membrane stack,
Obtain the starch sugar hydrolyzate after desalination and electrodialysis concentrated water.
The electrodialysis membrane stack can be it is multiple, such as 2,3,4,5,6,8 or 10.
The starch sugar hydrolyzate is by saccharification and filtered starch sugar hydrolyzate.The starch sugar hydrolyzate contains
Sugar amount is 20%-35%, such as sugar content is 22%, 25%, 28%, 30%, 32% or 34%, salt content 150-
1000mg/L, as 160mg/L, 170mg/L, 180mg/L, 190mg/L, 200mg/L, 300mg/L, 500mg/L, 700mg/L,
900mg/L or 950mg/L etc..The treatment effect of such starch sugar hydrolyzate is best.
Preferably, the ion-exchanger is inanimate matter class ion-exchanger and/or organic matter class ion-exchanger.
Preferably, the inanimate matter class ion-exchanger is zeolite.
Preferably, the organic matter class ion-exchanger is ion exchange resin or and/or ion-exchange fibre.
Preferably, the ion exchange resin be strongly acidic cation-exchange, it is strong basic type anion-exchange resin, weak
Acid type cation exchange resin, weak base type anion exchange resin, macroreticular ion exchange resin and gel type ionic exchange tree
In fat any one or at least two combination.
Preferably, the anion-exchange membrane and cation-exchange membrane are hypotonic permeable membrane.
Preferably, the hypotonic permeable membrane by optimize ion film formulation and preparation process with improve ionic membrane the degree of cross linking,
Exchange capacity and ion-selective permeability etc. and obtain.
Preferably, the anode is that titanium applies ruthenium iridium electrode, and cathode is that stainless steel electrode or titanium apply ruthenium iridium electrode.
Preferably, the pole room of the electrodialysis membrane stack is recycled by pole water, and the pole water is by NaCl and/or Na2SO4It prepares
It obtains.
Preferably, electrodialysis concentrated water recycles concentration in dense room.
Preferably, it is passed through starch sugar hydrolyzate in the light room and carries out multistage continuous desalination.
Preferably, the electrodialysis desalination carries out under constant potential.
Starch sugar hydrolyzate after the desalination is for producing starch sugar.
Preferably, vapo(u)rization system is discharged or entered to the electrodialysis concentrated water after recycling concentration in the dense room.
Electrodialysis desalination is carried out after first being pre-processed to starch sugar hydrolyzate again.
Preferably, the pretreatment is at the decolorization carried out successively, sterilization processing, temperature adjusting processing and filtering
Reason.
Preferably, the decolorization is：Adsorption bleaching is carried out to starch sugar hydrolyzate using activated carbon.
Preferably, the decolorization carries out on activated carbon adsorption device.
Preferably, the sterilization processing is heat treatment and/or ultraviolet lighting processing.
Preferably, the heat treatment is temperature is passed through into starch sugar hydrolyzate is 100-150 DEG C, such as 110 DEG C, 120
DEG C, 130 DEG C, the steam of 135 DEG C or 145 DEG C etc., so that the temperature of starch sugar hydrolyzate is increased to 100 DEG C, and keep 1-2h.
Preferably, the heat treatment is realized by steam generator.
Preferably, the ultraviolet lighting processing carries out on ultraviolet sterilizer.
Preferably, temperature adjusting, which is handled, is：The temperature of starch sugar hydrolyzate after the sterilization processing is adjusted to 20-40
DEG C, such as 22 DEG C, 25 DEG C, 28 DEG C, 30 DEG C, 32 DEG C, 35 DEG C or 38 DEG C.
Preferably, the temperature adjusts processing and is carried out on plate heat exchanger.
Preferably, the filtration treatment is membrane filtration.
Preferably, the membrane filtration carries out on purpose ceramic-film filter and/or organic membrane filter device.
The method further includes on-line cleaning step, and the on-line cleaning is for cleaning electrodialysis cell.
Preferably, the cleaning solution that the on-line cleaning uses is acid or alkali electroless cleaning agent.
Preferably, the electrodialysis cell is primary per 1-10 days on-line cleanings, such as every 2 days, 3 days, 4 days, 5 days, 6 days, 8 days
Or 9 days on-line cleanings are primary, if on-line cleaning can be determined according to the fouling membrane situation in electrodialysis cell.
Preferably, the duration of each on-line cleaning be 0.5-3h, as the duration be 1h, 1.5h, 2h, 2.5h or
2.8h waiting.
Described method includes following steps as a preferred technical solution,：
(1) decolorization is carried out to starch sugar hydrolyzate；
(2) sterilization processing is carried out to adsorption bleaching treated starch sugar hydrolyzate using heating and/or ultraviolet lighting；
(3) temperature for adjusting the starch sugar hydrolyzate after sterilization processing is 20-40 DEG C；
(4) membrane filtration processing is carried out to the starch sugar hydrolyzate that step (3) obtains；
(5) to membrane filtration, treated that starch sugar hydrolyzate carries out electrodialysis desalination in electrodialysis cell, wherein electric osmose
It includes at least one electrodialysis membrane stack to analyse unit, and the anion-exchange membrane and cation-exchange membrane in the electrodialysis membrane stack are
Hypotonic permeable membrane is filled with ion-exchanger in light room, obtains the starch sugar hydrolyzate after desalination and electrodialysis concentrated water.
Compared with prior art, beneficial effects of the present invention are：
(1) present invention, can be strong by filling ion-exchanger (such as ion exchange resin) in the light room of electrodialysis membrane stack
Change the Ion transfer in starch sugar hydrolyzate electrodialysis desalination system, improves the desalting efficiency of starch sugar hydrolyzate (after desalination
Starch sugar hydrolyzate salt content is less than 50mg/L or lower, and the desalting efficiency of single electrodialysis membrane stack is up to 40% or more), reduce energy
Consumption and reduction operating cost.
(2) present invention reduces ionic membrane leakage sugar loss (the sugared loss late of leakage is less than 0.5%), suppression by using hypotonic permeable membrane
The loss amount of sugar and syrup concentration decline during starch sugar hydrolyzate electrodialysis desalination processed, and the sugar of starch sugar hydrolyzate can be improved
Yield is starched, while the energy consumption of follow-up syrup evaporation and crystal process can be reduced.
(3) present invention proposes, by heating, ultraviolet light and membrane filtration etc., starch sugar hydrolyzate to be sterilized and removed is useless
Suspended matter, colloid, larger molecular organics and thalline of water etc., while electrodialysis membrane stack is carried out periodically using on-line cleaning system
Cleaning, makes the amberplex after pollution restore film properties, and the operation that starch sugar hydrolyzate electrodialysis desalination system can be improved is steady
It is qualitative.
Description of the drawings
Fig. 1 is the process flow chart for starch sugar hydrolyzate desalination that one embodiment of the present invention provides.
Fig. 2 is the structural schematic diagram for the electrodialysis membrane stack that one embodiment of the present invention provides.
Wherein：1, anode；2, cathode；3, cation-exchange membrane；4, anion-exchange membrane；5, pole hydroecium is (containing anode chamber, the moon
Pole room)；6, dense room；7, light room.
Fig. 3 is that pretreatment+ion that embodiment 1 provides strengthens the photo after migration electrodialysis membrane stack dismounting, wherein (a)
The anion-exchange membrane (surface adhesion has more resin) after electrodialysis desalination, be (b) after electrodialysis desalination sun from
Proton exchange (surface adhesion has a small amount of resin).
Fig. 4 is that the anion-exchange membrane that comparative example 1 provides carries out the macro morphology figure (a) before electrodialysis and SEM figures (b).
Fig. 5 be comparative example 1 provide electrodialysis after as the light room face of cavity block anion-exchange membrane macro morphology figure (a)
And SEM figures, wherein (b) is the SEM figures of the anion-exchange membrane of slight pollution, (c) is the anion-exchange membrane seriously polluted
SEM schemes.
Fig. 6 be comparative example 1 provide electrodialysis after as the dense room face of cavity block anion-exchange membrane macro morphology figure (a)
And SEM figures, wherein (b) is the SEM figures of the anion-exchange membrane of slight pollution, (c) is the anion-exchange membrane seriously polluted
SEM schemes.
Fig. 7 is that the cation-exchange membrane that comparative example 1 provides carries out the macro morphology figure (a) before electrodialysis and SEM figures (b).
Fig. 8 be comparative example 1 provide electrodialysis after as the light room face of anode membrane cation-exchange membrane macro morphology figure (a)
And SEM figures, wherein (b) is the SEM figures of the anion-exchange membrane of slight pollution, (c) is the anion-exchange membrane seriously polluted
SEM schemes.
Fig. 9 be comparative example 1 provide electrodialysis after as the dense room face of anode membrane cation-exchange membrane macro morphology figure (a)
And SEM figures, wherein (b) is the SEM figures of the anion-exchange membrane of slight pollution, (c) is the anion-exchange membrane seriously polluted
SEM schemes.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the process flow chart for the starch sugar hydrolyzate desalination that one embodiment of the present invention provides.The technique stream
Journey includes connected pretreatment unit and electrodialysis cell, and wherein pretreatment unit includes decoloration unit, sterili-sation unit, temperature tune
It saves unit and filter element, the electrodialysis cell is as shown in Figure 2.The technique of the desalination is：Through saccharification and filtered shallow lake
Pulverized sugar hydrolyzate is decolourized by activated carbon adsorption first；Steam heating (vapor (steam) temperature is 100-150 DEG C) and ultraviolet is carried out later
Light is sterilized；Starch sugar hydrolyzate after sterilization carries out membrane filtration after plate heat exchanger temperature control (temperature is adjusted to 20-40 DEG C),
The membrane filtration carries out on membrane filter, and the membrane filter is purpose ceramic-film filter and/or organic membrane filter device；Finally,
Filtered filtrate is subjected to electrodialysis desalination, obtains the starch sugar hydrolyzate after desalination and electrodialysis concentrated water.Shallow lake after desalination
Pulverized sugar hydrolyzate evaporative crystallization obtains starch sugar product.Wherein, the starch sugar hydrolyzate salt content after desalination be less than 50mg/L or
It is lower, multi-effect evaporation system can be directly entered and be evaporated crystallization, the concentrated water that electrodialysis cell generates can be passed through electrodialysis membrane stack
Dense room in carry out cycle concentration, so that its salt content is reached, 1%-10% is even higher, COD is less than 50mg/L, meets Industry Waste
Evaporation concentration system, obtained evaporation condensate reuse can be arranged or be entered to water discharge standard, a small amount of concentrated water directly outer.
Fig. 2 is the structural schematic diagram for the electrodialysis membrane stack that one embodiment of the present invention provides.The electrodialysis membrane stack packet
It includes：Anode 1, cathode 2, cation-exchange membrane 3 and anion-exchange membrane 4 and partition board and clamp device etc..The anion is handed over
Formation pole room 5 between film 4 and cathode 2 is changed, the cation-exchange membrane 3 and anode 1 form pole room 5, anion-exchange membrane 4 and sun
Amberplex 3 is alternately arranged to form dense room 6 and light room 7, and ion-exchanger is filled in light room 7.Wherein, anode 1 uses titanium
Ruthenium iridium electrode is applied, cathode 2 uses stainless steel electrode, when electrodialysis system controls frequently pole-reversing by PLC system, then cathode 2
It is also required to apply ruthenium iridium electrode using titanium；Cation-exchange membrane 3 and anion-exchange membrane 4 use hypotonic permeable membrane, inhibit starch syrup
Water and sugar are leaked by amberplex during solution solution electrodialysis；Pole room 5 by recycling pole water, primarily serve it is conductive,
Cooling and the effect for rinsing electrode, pole water generally use NaCl, Na2SO4Deng preparation；Dense room 6 cycles through the progress of electrodialysis concentrated water
Cycle concentration, the salt content of concentrated water gradually rises during electrodialysis desalination, is discharged when reaching a certain concentration；Light room 7 is passed through
Starch sugar hydrolyzate after pretreatment, wherein the ion-exchanger filled is used for that the Ion transfer of electrodialytic process is promoted to pass
It passs, starch sugar hydrolyzate can make the salt content of desalination syrup drop to less than 50mg/L or lower by multistage desalination, meet life
Produce starch sugar product requirement.
Embodiment 1：Pretreatment+enhancing ion migration electrodialysis is used for starch sugar hydrolyzate desalination
In the present invention unless otherwise specified "+" be " and " the meaning.
After being pre-processed to starch sugar hydrolyzate, then using enhancing ion migration electrodialysis progress desalination.Concrete operations
Steps are as follows：
(1) activated carbon is used to carry out decolorization to starch sugar hydrolyzate；
(2) sterilization processing is carried out to adsorption bleaching treated starch sugar hydrolyzate using heating and ultraviolet lighting；
(3) plate heat exchanger is used to adjust the temperature of the starch sugar hydrolyzate after sterilization processing as 20-40 DEG C；
(4) the starch sugar hydrolyzate that step (3) obtains is filtered processing over an organic film；
(5) by membrane filtration, treated that starch sugar hydrolyzate carries out electrodialysis in enhancing ion migration electrodialysis cell takes off
Salt, the enhancing ion migration electrodialysis cell are electrodialysis membrane stack shown in Fig. 2.
Starch sugar hydrolyzate electrodialysis desalination carries out cycle desalination in enhancing ion migration electrodialysis cell, in practical electricity
Continuous multi-stage desalination can be used during electrodialysis desalination, such as use continuous 3-8 grades of electrodialysis desalination, it need to be according to starch sugar hydrolyzate
Salt content and electrodialysis desalination performance and desalination target etc. determine.The electrodialysis membrane stack is as shown in Fig. 2, include：Anode
1, cathode 2, cation-exchange membrane 3, anion-exchange membrane 4, pole room 5, dense room 6 and light room 7.Wherein, cation-exchange membrane 3 and the moon
Amberplex 4 all uses hypotonic permeable membrane；The optional spent ion exchange resin of ion-exchanger filled in light room 7, such as strong-acid type
Cation exchange resin mixes filling or single filling with strong basic type anion-exchange resin, and weak-type and weak base can also be used
Type, macroporous type or gel-type etc..Specific experiment result is as follows：
Table 1：Pretreatment+ion strengthens migration electrodialysis desalination and tests primary data
Note：The cleaning solution is the liquid for cleaning electrodialysis membrane stack.
Table 2：Pretreatment+ion strengthens the migration light room experimental data of electrodialysis desalination
Table 3：Pretreatment+ion strengthens the migration dense room experimental data of electrodialysis desalination
The photo that pretreatment+ion is strengthened after migration electrodialysis membrane stack dismounting is as shown in Figure 3.As can be seen from the figure starch
Sugared hydrolyzate after pretreatment, enters back into enhancing ion migration electrodialysis desalination, and film does not occur in amberplex contaminated surface
Pollution.All there is not fouling membrane in two kinds of ion exchange film surfaces, thus it is speculated that related with light room filling ion-exchange resin.
Comparative example 1：Without pretreated starch sugar hydrolyzate using conventional electrodialysis desalination
Starch sugar hydrolyzate desalination is carried out using conventional electrodialysis without pretreated starch sugar hydrolyzate, investigates starch syrup
Solve the electrodialysis desalination effect and fouling membrane situation of liquid.
Starch sugar hydrolyzate properties of samples for electrodialysis desalination is as shown in table 4.Conventional electrodialysis desalination experiment uses
Constant voltage mode, application voltage are 5V, and initial current is about 0.054A, and current value constantly declines in electrodialytic process.
Experiment uses general commercial ionic membrane, electrodialysis desalination experiment to be investigated respectively without pretreated starch sugar hydrolyzate in electric osmose
Desalting effect during analysis and fouling membrane situation, the experimental results are shown inthe following table.
Table 4：General commercial ionic membrane electrodialysis desalination tests primary data
Experimental result without pretreated starch syrup solution solution electrodialysis desalination is as follows：
Table 5：Without the light room experimental data of pretreated starch syrup solution solution electrodialysis desalination
Table 6：Without the dense room experimental data of pretreated starch syrup solution solution electrodialysis desalination
After using conventional electrodialysis desalination without pretreated starch sugar hydrolyzate, the pollution condition of ion film surface is carried out
Analysis.Surface appearance feature before and after ion membrane electrodialysis compare as follows：
Above-mentioned desalination the experimental results showed that, starch sugar hydrolyzate using electrodialysis process have preferable desalting effect,
After recycling continuous desalination 90min, the salt content of starch sugar hydrolyzate is reduced to about 22mg/L or so from 271mg/L, can meet
Expected starch sugar desalination index.But simultaneously, it was also found that starch sugar hydrolyzate using conventional electrodialysis desalination desalting efficiency compared with
Low, under the conditions of constant potential, as the salinity in feed liquid is gradually reduced, current value also reduces therewith, to reach expected
Desalination index needs longer (about 90min), necessarily causes the production efficiency of unit membrane stack relatively low, and then causes to invest good luck row
Cost is higher, and therefore, it is difficult to really realize industrialized production application.
For the ionic membrane Analysis of Surface Topography (as shown in figures 4-9) before and after starch sugar hydrolyzate electrodialysis desalination, as a result
Show that anion/cation exchange membrane can all form apparent film in electrodialytic process compared with original anion/cation exchange membrane
Pollution, and the fouling membrane degree of film surface different zones is different.Anion/cation exchanges film surface and all generates apparent film dirt
Dye, and the fouling membrane that the film surface of membrane stack water inlet end is formed is more serious.Stereoscan photograph shows that part film surface has largely
Mycelia generates, and the fouling membrane in the rooms the light room Mian Binong face of feeding liquid is also more notable, and discovery has apparent pollutant to be adsorbed on film
Surface.Show that before starch sugar hydrolyzate carries out electrodialysis desalination pretreatment appropriate must be carried out, removes in starch sugar hydrolyzate
The component for causing electrodialytic membranes to pollute, such as organic matter and microorganism.The anion/cation exchange membrane indicates anion-exchange membrane
Or cation-exchange membrane.
Comparative example 2：Conventional ion film carries out starch sugar hydrolyzate electrodialysis desalination with hypotonic permeable membrane
The experiment of starch sugar hydrolyzate electrodialysis desalination is carried out using conventional ion film and hypotonic permeable membrane, investigates different ions film
The leakage sugar phenomenon of electrodialysis desalination process.Starch sugar hydrolyzate is first filtered through PP cottons, and filtrate property is：PH 4.61-5.91, electricity
Conductance 300-425 μ s/cm, salinity 150-220mg/L, pol 20.2%-25.3%.Suction due to the filtering of PP cottons to sugar
It is attached to cause part, ultra-pure water can be used, PP cottons are backwashed, partial starch sugar can be recycled in flushing liquor.
Use conventional electrodialysis desalination again through the filtered starch sugar hydrolyzate of PP cottons.Electrodialysis experiment uses constant voltage mould
Formula, voltage 5V, initial current is about 0.054A, and current value constantly declines in electrodialytic process.Electrodialysis desalination is real
The desalting effect and the sugared phenomenon of leakage for having investigated different batches and different ions exchange membrane (normal film and hypotonic permeable membrane) respectively are tested, it is real
Test that the results are shown in table below.Wherein, table 7 and table 8 are that first batch starch sugar hydrolyzate carries out electrodialysis experiment using normal film
Experimental data；Table 9 and table 10 are the experimental datas that second lot starch sugar hydrolyzate carries out electrodialysis experiment using normal film.
Table 7：Electrodialytic light room experimental data is carried out using normal film
Table 8：Electrodialytic dense room experimental data is carried out using normal film
Table 9：Electrodialytic light room experimental data is carried out using normal film
Table 10：Electrodialytic dense room experimental data is carried out using normal film
Starch sugar hydrolyzate electrodialysis desalination, different batches desalination experimental result table are carried out using general commercial ionic membrane
It is bright：(1) different batches experiment in by cycle desalination, starch sugar hydrolyzate salinity can be decreased to less than 50mg/L hereinafter, and
Electrodialysis concentrated water salt content gradually rises；(2) under the conditions of constant voltage, as the salinity of starch sugar hydrolyzate continuously decreases,
Its current value is also on a declining curve；(3) sugared phenomenon is leaked：This general commercial ionic membrane is during starch sugar electrodialysis desalination
In the presence of the sugared phenomenon of apparent leakage, starch sugar hydrolyzate salt content in desalination processes is gradually reduced, and the sugar content in concentrated water by
Edge up height.It is in obviously increase trend as experimentai batches increase the sugared phenomenon of its leakage.Therefore, this general commercial ionic membrane is uncomfortable
It shares in the electrodialysis desalination of starch sugar hydrolyzate.
Starch sugar hydrolyzate electrodialysis desalination uses hypotonic permeable membrane.Electrodialysis, which is tested, uses constant voltage mode, voltage 5V,
Initial current is 0.054A, and current value can be gradually reduced during electrodialysis desalination.
Table 11：The primary data of electrodialysis desalination experiment is carried out using hypotonic permeable membrane
Table 12：Electrodialytic light room experimental data is carried out using hypotonic permeable membrane
| Test period/min | pH | Conductivity/μ s/cm | Salinity/mg/L | Pol | Liquid level |
| Before energization | 5.49 | 405 | 203 | 22.6 | - |
| 0 | - | 432 | 216 | 19.0 | 257 |
| 10 | - | 357 | 178.4 | 19.0 | 260 |
| 20 | - | 295 | 147.5 | 18.9 | - |
| 30 | - | 239 | 119.3 | 18.9 | - |
| 40 | - | 189.2 | 94.6 | 18.6 | - |
| 50 | - | 156.6 | 78.3 | 18.7 | 262 |
| 60 | - | 129.5 | 64.8 | 18.8 | - |
| 70 | - | 106.8 | 53.3 | 18.6 | - |
| 80 | 4.01 | 86.4 | 43.2 | 18.4 | 263 |
| 90 | - | 74.1 | 35.5 | 18.4 | - |
| 100 | 4.01 | 60.9 | 30.4 | 18.3 | - |
Table 13：Electrodialytic dense room experimental data is carried out using hypotonic permeable membrane
The experimental results showed that salinity declines in light room in electrodialytic process, salinity rises in dense room, until passing through
When 80min, salinity drops to 43.2mg/L in light room, although the requirement that desalination syrup salt content is less than 50mg/L can be met,
But there are still the relatively low problems of desalting efficiency.Pol is also gradually reduced in light room, but pol is 0 always in dense room, thus it is speculated that may
It is that amberplex adsorption sugar results in the decline of pol or the water in concentrated water moves to light room and sugared concentration reduction is caused to make
At.The loss of pol is mainly used for amberplex and is caused to absorption such as pols i.e. in the system, but does not find due to starch
The migration of sugared cross-film and caused by pol lose, show that this film has good inhibiting effect to starch sugar hydrolyzate leakage sugar.Research
Show to be used for starch sugar hydrolyzate desalination using hypotonic permeable membrane, can effectively inhibit the leakage sugar phenomenon of electrodialytic process.
Embodiment 1 is compared with comparative example 1 and 2 it is found that compared with conventional electrodialysis desalination system, pre-process+strong
Change Ion transfer electrodialysis desalination to have the following advantages that：
(1) desalination rate：In pretreatment+enhancing ion migration electrodialysis system, even if the saliferous of starch sugar hydrolyzate
Amount is higher, its salt content, which can be stablized, after about 70min is removed to less than 50mg/L hereinafter, different batches experiment shows the body
It is that can shorten about 1/10~1/2 the desalination time, and this variation and the resin type filled in the light room of membrane stack are closely related.
It is indicated above that enhancing ion migration electrodialysis can significantly improve starch sugar hydrolyzate desalting efficiency, shorten the production cycle and
Reduce energy consumption etc..
(2) sugar loss：In pretreatment+enhancing ion migration electrodialysis system, the ion exchange resin of filling is to starch
Sugar in sugared hydrolyzate has suction-operated that can cause a small amount of sugar loss, but the ion due to being filled in the light room of electrodialysis membrane stack
Exchanger resin amount is less, and the sugar amount of absorption is also than relatively limited, therefore the sugar thereby resulted in during continuous electrodialysis desalination
Loss almost can be ignored.
(3) sugared phenomenon is leaked：In pretreatment+enhancing ion migration electrodialysis system, as a result of improved hyposmosis
Film, almost without observing any starch sugar leakage phenomenon, therefore starch syrup during multiple batches of starch sugar electrodialysis desalination
Sugar in solution liquid will not cause damages because of the leakage sugar of ionic membrane.When electrodialysis concentrated water is using the inorganic salt solution prepared
When, COD is hardly increased, i.e. electrodialysis concentrated water COD can stablize less than 50mg/L, and concentrating its salt content through cycle can reach
10% or more, it can meet and arrange standard outside industrial wastewater, therefore directly outer can arrange or enter vapo(u)rization system.
(4) desalinating process：In pretreatment+enhancing ion migration electrodialysis system, since the ion-exchanger of filling has
It is conductive, therefore current density during constant potential electrodialysis desalination is larger, also implies that the system can keep very fast
Ion transfer and salt remove rate.Will not decline because of solution salt content causes resistance to increase, and electric energy can be made to be converted into this way
The phenomenon that thermal energy, is significantly suppressed, and the desalination time shortens, therefore the solution temperature of its light room and dense room does not all occur
Significant changes.
(5) system stability：In pretreatment+enhancing ion migration electrodialysis system, in the ion of the light room filling of membrane stack
Exchanger can promote the turbulence effect of light room solution notable, therefore the electric double layer thickness of ion film surface can be obviously reduced, in turn
The cross-film of starch sugar hydrolyzate intermediate ion can be promoted to migrate；Secondly as filling ion-exchanger causes near ion film surface
The local dip of solution can also inhibit the Adsorption of Organic in starch sugar hydrolyzate to ion film surface, in certain journey
The formation and aggravation that can inhibit fouling membrane in the system on degree, can keep electrodialysis system that can run steadily in the long term.In Fig. 3
Fouling membrane is not observed in the photo that ion strengthens after migration electrodialysis membrane stack dismounting.Therefore it can also promote enhancing ion migration electric
The practical application of starch sugar hydrolyzate advanced desalination technology in dialysis system.
The above result shows that pretreatment proposed by the present invention+ion strengthens migration electrodialysis for starch sugar hydrolyzate
Advanced desalination has higher desalting efficiency, while sugar can be overcome serious etc. by amberplex generation leakage and fouling membrane
Problem, application prospect is good and is suitble to large-scale promotion application.
Applicant states, the foregoing is merely the specific implementation mode of the present invention, but protection scope of the present invention not office
It is limited to this, person of ordinary skill in the field is it will be clearly understood that any belong to those skilled in the art and taken off in the present invention
In the technical scope of dew, the change or replacement that can be readily occurred in are all fallen within protection scope of the present invention and the open scope.
Claims (30)
1. a kind of electrodialysis plant method for starch sugar hydrolyzate desalination, the method uses de- for starch sugar hydrolyzate
The electrodialysis plant of salt, described device include electrodialysis cell, and the electrodialysis cell is at least one electrodialysis membrane stack, described
Electrodialysis membrane stack includes cathode, anode, anion-exchange membrane and cation-exchange membrane, and the anion-exchange membrane and cation are handed over
It changes film to be alternately arranged to form light room and dense room, which is characterized in that be filled with ion-exchanger in the light room；The anion is handed over
It is hypotonic permeable membrane to change film and cation-exchange membrane；
Described device further includes the pretreatment unit being connected with electrodialysis cell；The pretreatment unit includes sequentially connected de-
Color element, sterili-sation unit, thermostat unit and filter element；
The method is：Starch sugar hydrolyzate is subjected to electrodialysis desalination in the electrodialysis plant, wherein the electrodialysis
Desalination carries out at least one electrodialysis membrane stack, and the anion-exchange membrane and cation-exchange membrane in the electrodialysis membrane stack are equal
For hypotonic permeable membrane, it is filled with ion-exchanger in light room, obtains the starch sugar hydrolyzate after desalination and electrodialysis concentrated water；
Electrodialysis desalination is carried out after first being pre-processed to starch sugar hydrolyzate again, the pretreatment is at the decoloration carried out successively
Reason, sterilization processing, temperature adjust processing and filtration treatment.
2. according to the method described in claim 1, it is characterized in that, the ion-exchanger is inanimate matter class ion-exchanger
And/or organic matter class ion-exchanger.
3. according to the method described in claim 2, it is characterized in that, the inanimate matter class ion-exchanger is zeolite.
4. according to the method described in claim 2, it is characterized in that, the organic matter class ion-exchanger is ion exchange resin
And/or ion-exchange fibre.
5. according to the method described in claim 4, it is characterized in that, the ion exchange resin, which is strong-acid type cation, exchanges tree
Fat, strong basic type anion-exchange resin, weak-type cation exchange resin, weak base type anion exchange resin, macroporous type ion
In exchanger resin or gel-type ion-exchange resin any one or at least two combination.
6. according to the method described in claim 1, it is characterized in that, the anode, which is titanium, applies ruthenium iridium electrode, the cathode is not
Become rusty steel electrode or titanium painting ruthenium iridium electrode.
7. according to the method described in claim 1, it is characterized in that, the pole room of the electrodialysis membrane stack is connected with infusion pump, institute
Infusion pump driving pole water is stated to recycle in pole room.
8. according to the method described in claim 1, it is characterized in that, electrodialysis membrane stack concentrated water in the dense room recycle it is dense
Contracting.
9. according to the method described in claim 1, it is characterized in that, the starch sugar hydrolyzate carries out multistage take off in light room
Salt.
10. according to the method described in claim 1, it is characterized in that, the electrodialysis cell is operated using constant potential.
11. according to the method described in claim 1, it is characterized in that, the decoloration unit includes activated carbon adsorption device.
12. according to the method described in claim 1, it is characterized in that, the decolorising agent that the decoloration unit uses is activated carbon.
13. according to the method described in claim 1, it is characterized in that, the sterili-sation unit includes steam generator and/or ultraviolet
Line sterilizer.
14. according to the method described in claim 1, it is characterized in that, the thermostat unit includes plate heat exchanger.
15. according to the method described in claim 1, it is characterized in that, the filter element includes purpose ceramic-film filter and/or has
Machine membrane filter.
16. according to the method described in claim 1, it is characterized in that, described device further includes for cleaning electrodialysis cell
On-line cleaning unit, the on-line cleaning unit include circulating pump and cleaning solution storage tank, and being stored in cleaning solution storage tank has cleaning solution,
The circulating pump makes cleaning solution be recycled between electrodialysis heap film and cleaning solution storage tank.
17. according to the method for claim 16, which is characterized in that the cleaning solution is acid or alkali electroless cleaning agent.
18. according to the method described in claim 1, it is characterized in that, the starch sugar hydrolyzate is after being saccharified and filtering
Starch sugar hydrolyzate.
19. according to the method described in claim 1, it is characterized in that, the sugar content of the starch sugar hydrolyzate is 20%-
35%, salt content 150-1000mg/L.
20. according to the method described in claim 1, it is characterized in that, the hypotonic permeable membrane is by changing film formula and technique
And/or it carries out film surface and modifies to obtain.
21. according to the method described in claim 1, it is characterized in that, be passed through water cycle in pole in the pole room of the electrodialysis membrane stack,
The pole water is by NaCl and/or Na2SO4Preparation obtains.
22. according to the method described in claim 1, it is characterized in that, the starch sugar hydrolyzate after the desalination forms sediment for producing
Pulverized sugar.
23. according to the method described in claim 1, it is characterized in that, the electrodialysis concentrated water recycles concentration in the dense room
Vapo(u)rization system is discharged or entered afterwards.
24. according to the method described in claim 1, it is characterized in that, the decolorization is：Using activated carbon to starch syrup
It solves liquid and carries out adsorption bleaching.
25. according to the method described in claim 1, it is characterized in that, the sterilization processing is heat treatment and/or ultraviolet lighting
Processing.
26. according to the method for claim 25, which is characterized in that the heat treatment is to be passed through into starch sugar hydrolyzate
The steam that temperature is 100-150 DEG C, makes the temperature of starch sugar hydrolyzate be increased to 100 DEG C, and keep 1-2h.
27. according to the method described in claim 1, it is characterized in that, temperature adjusting processing is：By the shallow lake after the sterilization processing
The temperature of pulverized sugar hydrolyzate is adjusted to 20-40 DEG C.
28. according to the method for claim 16, which is characterized in that the electrodialysis cell was per 1-10 days on-line cleanings one
It is secondary.
29. according to the method for claim 16, which is characterized in that the time of each on-line cleaning of electrodialysis cell is
0.5-3h。
30. according to the method described in claim 1, it is characterized in that, described method includes following steps：
(1) decolorization is carried out to starch sugar hydrolyzate；
(2) sterilization processing is carried out to adsorption bleaching treated starch sugar hydrolyzate using heating and/or ultraviolet lighting；
(3) temperature for adjusting the starch sugar hydrolyzate after sterilization processing is 20-40 DEG C；
(4) membrane filtration processing is carried out to the starch sugar hydrolyzate that step (3) obtains；
(5) to membrane filtration, treated that starch sugar hydrolyzate carries out electrodialysis desalination in electrodialysis cell, wherein electrodialysis list
Member includes at least one electrodialysis membrane stack, and the anion-exchange membrane and cation-exchange membrane in the electrodialysis membrane stack are hypotonic
Permeable membrane is filled with ion-exchanger in light room, obtains the starch sugar hydrolyzate after desalination and electrodialysis concentrated water.
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